A method for overall waterborne hoisting and assembly of a floating bridge

Abstract

The present invention discloses an overall waterborne hoisting and assembling method for a pontoon bridge, which includes: erecting a bottom platform; towing pontoons to the bottom platform and filling water into the pontoons so that the pontoons are seated on the bottom platform, and then finely adjusting the planar position of the pontoons by longitudinal and transverse jacks on the bottom platform; completing the segmented heightening of pier columns on the pontoons; installing temporary cantilevers on the main girder segments to be assembled; hoisting the main girder segments to be assembled as a whole, and docking the top pier columns on the rear bottom surface of the main girder segments to be assembled with the upper pier columns located on the bottom platform, and at the same time placing the cantilever ends of the load-bearing girders on the support pads on the assembled main girders; performing planar positioning and elevation adjustment on the main girder segments to be assembled by walking jacks; installing the connecting bolts of the matching parts between the main girder segments to be assembled and the assembled main girders; carrying out welding work; pumping out the water in the pontoons to make the pontoons float, and towing the assembled main girder segments away from the bottom platform by tugboats. The present invention can overcome the disadvantage of poor stability in waterborne docking.

Description

Technical Field

[0001] The present invention relates to a method for hoisting and assembling an integral pontoon bridge on water. Background Art

[0002] In the past 30 years, pontoon bridges have been applied to modern infrastructure construction. Their technology has developed rapidly and gradually become mature, and they can be an important part of modern infrastructure. However, compared with land bridges including cable-stayed bridges and suspension bridges, the information on pontoon bridges is still very limited, especially the construction records, environmental conditions, durability, operation, and performance of pontoon bridges. At present, the number of long pontoon bridges in the world is very limited, only about 20.

[0003] Most of the pontoon bridges built abroad are of continuous pontoon structure. In this type of pontoon bridge, the square pontoons at the lower part are connected end to end to form a continuous floating body structure. The upper part of the pontoons can directly carry vehicle traffic loads, or piers or frame structures can be set to raise the deck elevation.

[0004] In the construction process of existing pontoon bridges, generally, a splicing structure is adopted. There are pontoon connectors between pontoon bridge monomers. The pontoon connectors dock the pontoon bridge monomers with each other to form an integral pontoon bridge structure. However, the pontoon bridge monomers are docked with each other on the water surface, which will cause insufficient stability between the pontoon bridge monomers, making it difficult to form an effective docking and resulting in great construction difficulties. Summary of the Invention

[0005] The purpose of the present invention is to overcome the defects of the prior art and provide a method for hoisting and assembling an integral pontoon bridge on water, which can overcome the disadvantage of poor docking stability on water and effectively ensure the assembling accuracy of the main girder.

[0006] The purpose of the present invention is achieved as follows: A method for hoisting and assembling an integral pontoon bridge on water, comprising the following steps:

[0007] Step 1, erect a bottom platform, which includes several steel pipe columns driven into the seabed, a platform plate fixed on the top surfaces of several steel pipe columns, longitudinal jacks and transverse jacks installed on the platform plate;

[0008] Step 2, tow the pontoons to the bottom platform, inject water into the pontoons using a water pump to make the pontoons sit on the bottom platform, and then use the longitudinal jacks and transverse jacks on the bottom platform to finely adjust the plane position of the pontoons;

[0009] Step 3, a crane ship hoists the upper pier column and docks it with the lower pier column already fixed on the pontoon to complete the sectional heightening of the pier column;

[0010] Step 4: Install a temporary cantilever on the front top surface of the main girder segment to be assembled. The temporary cantilever includes a load-bearing beam made of a steel structure, three groups of support pads, and a prestressed anchoring mechanism. A steel strand perforation is reserved between the middle top surface and the middle bottom surface of the load-bearing beam. The prestressed anchoring mechanism includes a steel strand bundle and a pair of anchor fittings. A steel strand perforation is also reserved between the head top surface and the head bottom surface of the main girder segment to be assembled. When installing the temporary cantilever, first place two groups of support pads on the front top surface of the main girder segment to be assembled, one in front of the other, and temporarily weld the two groups of support pads to the main girder segment to be assembled. Then place the load-bearing beam on the two groups of support pads, align the steel strand perforation on the load-bearing beam with the steel strand perforation on the main girder segment to be assembled, and temporarily weld the load-bearing beam to the two groups of support pads. Then manually thread the steel strand bundle and install the anchor fittings in the steel strand perforation, and then tension the steel strand bundle on the top of the load-bearing beam to complete the pre-tightening of the load-bearing beam and the main girder segment to be assembled.

[0011] Step 5: First, place a walking jack and another group of support pads on the top surface of the assembled main girder at a position corresponding to the cantilever end of the load-bearing beam.

[0012] Step 6: The crane ship hoists the main girder segment to be assembled together with the temporary cantilever as a whole, docks the top pier column on the rear bottom surface of the main girder segment to be assembled with the upper pier column on the seat bottom platform, and at the same time places the cantilever end of the load-bearing beam on the main girder segment to be assembled on the top surface of a group of support pads on the assembled main girder.

[0013] Step 7: Lift the walking jack, drive the main girder segment to be assembled to move longitudinally and transversely by the load-bearing beam of the temporary cantilever to achieve the planar positioning of the main girder segment to be assembled, and adjust the elevation difference of the main girder segment to be assembled through the vertical cylinder of the walking jack to meet the specification requirements.

[0014] Step 8: After the relative position adjustment of the main girder segment to be assembled is completed, install the connecting bolts for the matching parts at the front end of the main girder segment to be assembled and the matching parts at the rear end of the assembled main girder to complete the temporary positioning of the front end of the main girder segment to be assembled.

[0015] Step 9: The crane ship releases the hook of the main girder segment to be assembled and withdraws from the working area.

[0016] Step 10: Carry out the welding work between the top pier column of the main girder segment to be assembled and the upper pier column on the seat bottom platform, and carry out the welding work between the front end of the main girder segment to be assembled and the rear end of the assembled main girder.

[0017] Step 11: Remove the temporary cantilever, the walking jack, and the working platform on the pier column.

[0018] Step 12: Pump out the water in the pontoons on the seat bottom platform to make the pontoons float, and use a tugboat to tow the assembled main girder segment away from the seat bottom platform.

[0019] Step 13: Repeat Steps 2 to 12 to assemble the next main girder section.

[0020] In the above-described method for hoisting and assembling the floating bridge as a whole, in Step 3, an inner flange is welded to the top surface of the lower pier column and the bottom surface of the upper pier column respectively. When the lower pier column is docked with the upper pier column, first use pins to connect the bolt holes at the four corners of the inner flange to quickly position between the upper pier column and the lower pier column, then connect the bolts of the remaining bolt holes of the inner flange to complete the docking between the upper pier column and the lower pier column, and finally weld the side steel plates of the lower pier column and the side steel plates of the upper pier column; when the lower pier column is docked with the upper pier column, a working platform is erected on the upper part of the lower pier column.

[0021] In the above-described method for hoisting and assembling the floating bridge as a whole, in Step 6, an inner flange is welded to the bottom surface of the upper pier column and the bottom surface of the top pier column respectively. When the upper pier column is docked with the top pier column, first use pins to connect the bolt holes at the four corners of the inner flange to quickly position between the upper pier column and the top pier column, then connect the bolts of the remaining bolt holes of the inner flange to complete the docking between the top pier column and the upper pier column; when the upper pier column is docked with the top pier column, a working platform is erected on the upper part of the upper pier column.

[0022] The method for hoisting and assembling the floating bridge as a whole of the present invention has the following characteristics: A bottom platform is erected on the water, and the pontoons are located on the bottom platform by injecting water for positioning the pontoons. Then, the height of the pier columns to be installed is increased on the pontoons. Next, the rear part of the main girder section to be assembled is connected to the pier columns, and the front end of the main girder section to be assembled is docked with the rear end of the assembled main girder through a temporary cantilever, overcoming the disadvantage of poor stability in water docking and effectively ensuring the assembly accuracy of the main girder. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic diagram of the state when Step 2 of the present invention is carried out;

[0024] Figure 2 is a schematic diagram of the state when Step 3 of the present invention is carried out;

[0025] Figure 2a is a detailed structural schematic diagram of the state when Step 3 of the present invention is carried out;

[0026] Figure 3 is a schematic diagram of the state when Step 4 of the present invention is carried out;

[0027] Figure 4 is a first schematic diagram of the state when Step 6 of the present invention is carried out;

[0028] Figure 5 is a second schematic diagram of the state when Step 6 of the present invention is carried out;

[0029] Figure 6 It is a schematic diagram of the state when performing Step Seven of the present invention;

[0030] Figure 7 It is a schematic diagram of the state when performing Step Eight of the present invention;

[0031] Figure 7a It is a schematic diagram of the arrangement of the matching parts on the splicing end face of the main beam of the pontoon bridge of the present invention;

[0032] Figure 8 It is a schematic diagram of the state when performing Step Ten of the present invention. Detailed Embodiment

[0033] The present invention will be further described below in conjunction with the accompanying drawings.

[0034] Please refer to Figures 1 to 8 , the method for waterborne hoisting and assembling of the overall pontoon bridge of the present invention includes the following steps:

[0035] Step One, erect a bottom platform 1, which includes several steel pipe columns driven into the seabed, a platform plate fixed on the top surfaces of several steel pipe columns, a longitudinal jack and a transverse jack installed on the platform plate;

[0036] Step Two, use a tugboat to tow the pontoon 2 to the bottom platform 1, inject water into the pontoon 2 using a water pump to make the pontoon 2 sit on the bottom platform 1, and then use the longitudinal jack and the transverse jack on the bottom platform 1 to finely adjust the planar position of the pontoon 2 (see Figure 1 );

[0037] Step Three, a crane ship 100 hoists the upper pier column 22 and docks it with the lower pier column 21 that has been fixed on the pontoon 2 to complete the sectional heightening of the pier column 20; an inner flange 2A is welded on the top surface of the lower pier column 21 and the bottom surface of the upper pier column 22 respectively. When the lower pier column 21 is docked with the upper pier column 22, a working platform 2B is erected on the upper part of the lower pier column 21. First, the bolt holes at the four corners of the inner flange 2A are connected with pins to complete the quick positioning between the upper pier column 22 and the lower pier column 21, and then the bolts of the remaining bolt holes of the inner flange 2A are connected to complete the docking between the upper pier column 22 and the lower pier column 21. Finally, the side steel plates of the lower pier column 21 and the side steel plates of the upper pier column 22 are welded (see Figure 2 and Figure 2a );

[0038] Step 4: Install a temporary cantilever 4 on the front top surface of the main girder segment 3A to be assembled. The temporary cantilever 4 includes a load-bearing beam 4A made of a steel structure, three groups of support pads 40, and a prestressed anchoring mechanism. A steel strand perforation is reserved between the middle top surface and the middle bottom surface of the load-bearing beam 4A. The prestressed anchoring mechanism includes a steel strand bundle 41 and a pair of anchor fittings 42. A steel strand perforation is also reserved between the head top surface and the head bottom surface of the main girder segment 3A to be assembled. When installing the temporary cantilever 4, first place two groups of support pads 40 on the front top surface of the main girder segment 3A to be assembled, one in front of the other, and temporarily weld the two groups of support pads 40 to the main girder segment 3 to be assembled. Then place the load-bearing beam 4A on the two groups of support pads 40, align the steel strand perforation on the load-bearing beam 4A with the steel strand perforation on the main girder segment 3A to be assembled, and temporarily weld the load-bearing beam 4A to the two groups of support pads 40. Then manually thread the steel strand bundle 41 and install the anchor fittings 42 in the steel strand perforation, and then tension the steel strand bundle 41 on the top of the load-bearing beam 4A to complete the pre-tightening of the load-bearing beam 4A and the main girder segment 3A to be assembled (see Figure 3 ).

[0039] Step 5: Place a walking jack 5 and another group of support pads 40 on the top surface of the assembled main girder 3B at a position corresponding to the cantilever end of the load-bearing beam 4A.

[0040] Step 6: The crane ship 100 hoists the main girder segment 3A to be assembled together with the temporary cantilever 4 as a whole, docks the top pier column 23 on the rear bottom surface of the main girder segment 3A to be assembled with the upper pier column 22 located on the seat bottom platform 1, and at the same time places the cantilever end of the load-bearing beam 4A on the main girder segment 3A to be assembled on the top surface of a group of support pads 40 on the assembled main girder 3B (see Figure 4 and Figure 5 ). When docking the top pier column 20 with the upper pier column 22, build a working platform 2B on the upper part of the upper pier column 22. Weld an inner flange 2A on the bottom surface of the upper pier column 22 and the bottom surface of the top pier column 23 respectively. First, connect the bolts at the four corners of the inner flange 2A with pins to complete the rapid positioning between the top pier column 23 and the upper pier column 22, and then connect the bolts at the remaining bolt holes of the inner flange 2A to complete the docking between the top pier column 23 and the upper pier column 22.

[0041] Step 7: Lift the walking jack 5, and drive the main girder segment 3A to be assembled to move longitudinally and transversely by the load-bearing beam 4A of the temporary cantilever 4 to achieve the plane positioning of the main girder segment 3A to be assembled. Adjust the elevation difference of the main girder segment 3A to be assembled through the vertical cylinder of the walking jack 5 to meet the specification requirements (see Figure 6 ).

[0042] Step 8. After the relative position adjustment of the to-be-assembled main girder segment 3A is completed, install the connecting bolts 31 for the mating part 30 at the front end of the to-be-assembled main girder segment 3A and the mating part 30 at the rear end of the assembled main girder 3B to complete the temporary positioning of the front end of the to-be-assembled main girder segment 3A (see Figure 7 and Figure 7a );

[0043] Step 9. The crane barge unhooks the to-be-assembled main girder segment and withdraws from the working area;

[0044] Step 10. Perform the welding work between the top pier column 23 of the to-be-assembled main girder segment 3A and the upper pier column 22 located on the seat bottom platform 1, and perform the welding work between the front end of the to-be-assembled main girder segment 3A and the rear end of the assembled main girder 3B (see Figure 8 );

[0045] Step 11. Remove the temporary cantilever, the walking jack and the working platform on the pier column;

[0046] Step 12. Pump out the water in the pontoon on the seat bottom platform to make the pontoon float, and use a tugboat to tow the assembled main girder segment away from the seat bottom platform;

[0047] Step 13. Repeat Steps 2 to 12 to assemble the next main girder segment.

[0048] The above embodiments are only for illustrating the present invention, rather than limiting the present invention. Those skilled in the relevant technical fields can also make various changes or modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions should also fall within the scope of the present invention, which should be defined by each claim.

Claims

1. A method for overall waterborne hoisting and assembling of a floating bridge, characterized in that, The hoisting and assembling method includes the following steps: Step 1: Erect a bottom platform, which includes several steel pipe columns driven into the seabed, a platform plate fixed on the top surfaces of several steel pipe columns, longitudinal jacks and transverse jacks installed on the platform plate; Step 2: Tow the floating drum to the bottom platform, inject water into the floating drum by using a water pump to make the floating drum sit on the bottom platform, and then use the longitudinal jacks and transverse jacks on the bottom platform to finely adjust the plane position of the floating drum; Step 3: The crane ship hoists the upper pier column and docks it with the lower pier column that has been fixed on the floating drum to complete the sectional heightening of the pier column; Step 4: Install a temporary cantilever on the front top surface of the main beam segment to be assembled. The temporary cantilever includes a load-bearing beam made of a steel structure, three groups of support pads and a prestressed anchoring mechanism; a steel strand perforation is reserved between the top surface and the bottom surface in the middle of the load-bearing beam; the prestressed anchoring mechanism includes a steel strand bundle and a pair of anchor fittings; a steel strand perforation is also reserved between the top surface and the bottom surface at the head of the main beam segment to be assembled; when installing the temporary cantilever, first place two groups of support pads on the front top surface of the main beam segment to be assembled one after the other, and temporarily weld the two groups of support pads to the main beam segment to be assembled, then place the load-bearing beam on the two groups of support pads, align the steel strand perforation on the load-bearing beam with the steel strand perforation on the main beam segment to be assembled, and temporarily weld the load-bearing beam to the two groups of support pads. Then, manually thread the steel strand bundle and install the anchor fittings in the steel strand perforation, and then tension the steel strand bundle at the top of the load-bearing beam to complete the pre-tightening of the load-bearing beam and the main beam segment to be assembled; Step 5: First, place a walking jack and another group of support pads on the top surface of the assembled main beam at the position corresponding to the cantilever end of the load-bearing beam; Step 6: The crane ship hoists the main beam segment to be assembled together with the temporary cantilever as a whole, and docks the top pier column on the rear bottom surface of the main beam segment to be assembled with the upper pier column located on the bottom platform, and at the same time places the cantilever end of the load-bearing beam on the main beam segment to be assembled on the top surface of a group of support pads on the assembled main beam; Step 7: Lift the walking jack, and drive the main beam segment to be assembled to move longitudinally and transversely by the load-bearing beam of the temporary cantilever to realize the plane positioning of the main beam segment to be assembled, and adjust the elevation difference of the main beam segment to be assembled through the vertical cylinder of the walking jack to meet the specification requirements; Step 8: After the relative position adjustment of the main beam segment to be assembled is completed, install the connecting bolts of the matching parts at the front end of the main beam segment to be assembled and the matching parts at the rear end of the assembled main beam to complete the temporary positioning of the front end of the main beam segment to be assembled; Step 9: The crane ship releases the hook of the main beam segment to be assembled and withdraws from the working area; Step 10: Carry out the welding work between the top pier column of the main beam segment to be assembled and the upper pier column located on the bottom platform, and carry out the welding work between the front end of the main beam segment to be assembled and the rear end of the assembled main beam; Step 11: Remove the temporary cantilever, the walking jack and the working platform on the pier column; Step 12: Pump out the water in the floating drum on the bottom platform to make the floating drum float, and use a tugboat to tow the assembled main beam segment away from the bottom platform; Step 13: Repeat steps 2 to 12 to assemble the next section of the main beam.

2. The waterborne hoisting and assembly method of the integral floating bridge according to claim 1, characterized in that, Perform step three, weld an inner flange on the top surface of the lower pier and the bottom surface of the upper pier respectively, when the lower pier is butt-jointed with the upper pier, first connect the bolt holes at the four corners of the inner flange with pins to complete the rapid positioning between the upper pier and the lower pier, then connect the bolts of the remaining bolt holes of the inner flange to complete the butt-jointing between the upper pier and the lower pier, and finally weld the side steel plates of the lower pier and the side steel plates of the upper pier; when the lower pier is butt-jointed with the upper pier, set up a working platform on the upper part of the lower pier.

3. The method for waterborne hoisting and assembling of the integral pontoon bridge according to claim 1, characterized in that, Proceed to step six, weld an inner flange on the bottom surface of the upper pier column and the bottom surface of the top pier column respectively, when the upper pier column and the top pier column are butt-jointed, first connect the bolt holes at the four corners of the inner flange with pins to complete the rapid positioning between the upper pier column and the top pier column, and then connect the bolts of the remaining bolt holes of the inner flange to complete the butt-jointing between the top pier column and the upper pier column; when the upper pier column and the top pier column are butt-jointed, set up a working platform on the upper part of the upper pier column.

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